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Things worth knowing about "M46.0"
M46.0 is the ICD-10 code for spinal enthesopathy – a condition affecting the attachment sites of tendons and ligaments along the spine, causing pain and restricted movement.
What is M46.0 – Spinal Enthesopathy?
The ICD-10 code M46.0 refers to spinal enthesopathy, a condition involving the entheses – the sites where tendons, ligaments, and joint capsules attach to the bones of the spine. These junction zones are subject to significant mechanical stress and can become inflamed or undergo degenerative changes due to various causes.
Causes
Spinal enthesopathy can arise from multiple factors:
- Mechanical overload: Heavy physical labour, poor posture, or high-performance sports can chronically irritate the entheses.
- Inflammatory conditions: Rheumatic diseases such as ankylosing spondylitis or psoriatic arthritis are frequently associated with enthesopathy.
- Degenerative changes: Wear-and-tear processes (spondylarthrosis) can alter the entheses over time.
- Metabolic disorders: Conditions such as gout or diabetes mellitus may affect tendon attachment tissue.
- Genetic predisposition: A familial tendency is observed particularly in inflammatory forms.
Symptoms
Common symptoms associated with M46.0 include:
- Localised pain along the spine, often worsened by movement or physical activity
- Morning stiffness, especially in inflammatory cases
- Tenderness on palpation at specific segments of the cervical, thoracic, or lumbar spine
- Reduced spinal mobility
- Occasionally, radiating pain into the arms or legs if nerve structures are involved
Diagnosis
The diagnosis of spinal enthesopathy is established through:
- Medical history and physical examination: Assessment of pain location, range of motion, and pressure points
- Imaging: X-rays can reveal bony changes; MRI (magnetic resonance imaging) is particularly useful for detecting soft tissue involvement and early inflammatory changes
- Laboratory tests: Inflammatory markers (CRP, ESR), and HLA-B27 typing when ankylosing spondylitis is suspected
- Ultrasound: To evaluate tendon attachment zones and signs of inflammation
Treatment
Treatment is tailored to the underlying cause and severity of the condition:
Conservative Management
- Physiotherapy: Targeted exercise programmes to strengthen core muscles and improve spinal mobility
- Pain relief: Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac for pain and inflammation
- Local injections: Corticosteroid injections at the affected entheses can provide short-term relief
- Heat or cold therapy for symptom management
Pharmacological Therapy for Inflammatory Causes
- In cases of underlying rheumatic disease, disease-modifying antirheumatic drugs (DMARDs) or biologics (e.g. TNF inhibitors) may be prescribed
Surgical Treatment
- Surgery is rarely required and is reserved for treatment-resistant cases
When to See a Doctor?
Persistent back pain, pronounced morning stiffness, or radiating pain should prompt a timely medical evaluation to identify the underlying cause and initiate appropriate treatment.
References
- World Health Organization – ICD-10 Version 2019, Chapter XIII: Diseases of the musculoskeletal system and connective tissue, M46.0.
- Braun J, Sieper J. Ankylosing spondylitis. Lancet. 2007;369(9570):1379-1390.
- Moll JMH, Wright V. Psoriatic arthritis. Seminars in Arthritis and Rheumatism. 1973;3(1):55-78.
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